Admitted killer Calvin Nimoh was raging with anger after his girlfriend revealed she wanted to have an open relationship with him — and a lesbian tryst with a teen, just minutes before Nimoh fatally stabbed cancer researcher Dr. Mark Ernsting.

Nimoh testified Friday at his first-degree murder trial that he forgot everything that happened immediately after Ernsting, a total stranger, strolling in his downtown Toronto neighbourhood, propositioned him for sex by saying, “Do you want have some fun?”

When Nimoh regained consciousness, he was standing over Ernsting’s dying body as a McGill St. resident screamed at him.

“Something was wrong and I ran away,” Nimoh told his lawyer Charn Gill.

Mark Ernsting is pictured in this undated screen grab from a video. (Postmedia/handout)

Nimoh’s knife’s blade snapped when it was plunged into Ernsting’s head, remaining lodged in his brain. But the witness had no memory of the horrific violence.

He explained the “having fun” line is meant as a casual sexual proposition among gays. A condom was found in Ernsting’s pocket.

Nimoh was emotionally disturbed after his girlfriend, Tia Thompson, spurned him after he rejected her open relationship proposal. He gave her an ultimatum: Pick me or the other woman because you cannot have both. The other woman was 17 and cannot be legally identified as a young offender.

Thompson chose her girlfriend over Nimoh. He left her at College Park subway station and walked eastbound “to clear his mind,” said Nimoh. He met Ernsting, taking his evening stroll through his neighbourhood.

Flowers at a memorial at the spot where Mark Ernsting was stabbed to death on McGill St in downtown Toronto on Dec 15 on Thursday December 17, 2015. (Michael Peake/Toronto Sun)Michael Peake /
Michael Peake/Toronto Sun

Nimoh, 23, who has already pleaded guilty to manslaughter and thus admitted inflicting the lethal injuries to the 39-year-old Ryerson professor on Dec. 15, 2015, a happily married gay man, but the prosecution rejected that plea and intends to prove it’s a first-degree murder as a deliberate, planned homicide.

The prosecution is asserting Nimoh and Thompson’s teen lover were the two masked bandits who mugged and stabbed Glynis Brownsey, a Victoria-based opera and theatre director, some 90 minutes before Ernsting’s fatal attack.

Brownsey was walking through a park to a friend’s home in the Summerhill Ave.-Yonge St. area when the masked assailants robbed the then-65-year-old woman of her purse. She was stabbed four times in the torso.

The casket of Dr. Mark Ernsting is carried from The Church of the Redeemer in Toronto on Monday December 21, 2015. His husband , Robert Iseman (dark jacket, no tie), looks on. (Stan Behal/Toronto Sun)Stan Behal /
Stan Behal/Toronto Sun

Thompson’s girlfriend testified earlier that Nimoh told her he “caught a body,” meaning he believed he had killed the woman in the park, and confessed to killing Ernsting.

Nimoh denied making those comments to the teen. When Nimoh was arrested later, he was found with a red handle of a knife — without a blade — and a matching protective sheath.

In a loud voice, a crimson-faced Crown Attorney Michael Cantlon suggested Nimoh ran “from a crime scene because you knew you were responsible.”

“I never said I did nothing wrong, sir. I’m not here to deny anything, but you keep badgering me,” replied Nimoh.

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